Mold for slug-casting machines



'May 3 1927.

` 1,626,854 i R.v R. MEAD MOLD FOR SLUG CASTING MACHINES Filed Nov. 1'7,1926 IZ 1729.1. B i* `m 33 B2 l fr 3 i* *mi LT- vlilh m" V Hh '"uumullluullll l "muuu INPI Hh Ihr. I/

Patented May 3, 1927.

UNI-TED sTATes 1,626,854 PATENTv OFFICE.

RICHARD RUSSELL MEAD, 0F BROOKLYN, NEW YORK, ASSIGNOR TO MERGENTHALRLINOTYPE COMPANY,;A CORPORATION 0F NEW YORK.

`MOLD ron sLUG-onsrnve MACHINES.

' Application ledNovember 17, 1926, Serial No. 148,811.

My invention relates to typographical casting machines, suchv aslinotype machines of the general organization represented in the UnitedStates patent to O. Mergeir thaler No. 436,532, wherein a melting pot isarranged to deliver molten metal into a slotted mold and' up against acomposed line of matrices to produce a type-bar or slug bearing on itsedge type characters corresponding to the intaglio characters of thematrices. As these molds are usually constructed', the side walls of themold slot or cavity are formed by .a bottom or body portion and. anupper or cap portion, while the end walls are formed by two end portionsor liners held in place between the body and the cap portions. y y

In the manufacturer of the mold parts', which are made of steel, it isessential to harden them or at least those portions which form the moldcavity, in order to avoid the adherence of molten metal to the moldsurfaces as well as to resist wear upon said sur* faces during theejection of the cast slugs. This hardening' processl necessarilyv setsup internal stresses in the metal and frequently gives rise to warpingor distortion lof the casting surfaces when the mold is in use. `Toovercome these difficulties, `the cap and body portions of the mold, asdisclosed in my prior Letters Patent No` 1,569,386, have each been madein two separate sectionsinstead of in` one integral piece, the inner orbase sections which' constitute the side walls proper of the mold cavitybeing made ofl hardened steel and the outer sections which act' asreinforcements being made ofv unhardened steel. vVhile this' principleis readily applicable to molds of large size, such as those ofy the 42cmvariety,

other diiiculties have been encountered in the endeavor to apply it tomolds of smaller' size, such as those of the standard SO-em variety. Inother words, the amount or dis tribution of the metal in these smallermolds is such that, in making the cap portion in two sections, theunhardened steel reinforcing member, in order to be long enough andheavy enough to have thev proper strength, would leave the hardenedsteel base section too thin to properly accommodate the threads of theclamping screws and still present an unbroken slug formingsurface.

The present invention is intended to rem- .edy this condition andcontemplates a construction of the parts which will permit the capportion to be made in two separate sections screwed togetherin thedesired manner, without regard to the thicknessv (or thinness) of theinner' base section. To this end, the inner-base section of the moldcap, in thelpreferred embodiment illustrated,- is provided on its out-erface with internally threaded projections to receive the threadedportions of the clamping screws, and the outer reinforcing section isformed with correspon-ding recesses to accommodate said projections soas to permit the two sections to be clampedtogether in contactingrelation.

In the accompanying drawings, I have sho-wn my invention merely inpreferred forni and by way of example and as applied to a: particulartype of mold, but obviously many variations and .alterations may be madetherein and in its mode of application which will still be comprisedwithin its spirit. It should, therefore, beunderstood that do not wishto limit myself to any specific form or embodiment except in so far assuch limitations are specified in the claims.

Referring to the drawings:

Fig; l is a front elevation of a S0-ein mold embodying my improvement;

Fig. 2 is a transverse" section taken on line 2-2 of Fig. 1;

Fig. 3 is a perspective View of the reinforcing meinber detached; and

Fig. 4f is a similar view of the base portion.

The' present improvement is herein shown as applied to a .standard 3G-emmold of the unrecesse'd type, although it is equally applicable to moldsof larger or .smaller sizes of the recessed or unrecessed variety. Generally speaking, the mold comprises the body A, the cap B and theintermediate liners C', D; these parts being held together in assembledrelation by posts'lll rising from the` body A and engaging in notchesformed in the opposite ends of the cap B. The mold f body A is ofy usualconstruction and common to molds of the unrecessed type. The cap Bl onthe other` hand, while identical in shape and .size to caps ordinarilyused, is made up of an inner hardened steel base portion B1Yconstituting the upper side wall of the mold cavity and an outerunhardened steel reinforcing member B2, the twosecltl lions beingclan'iped together by means of screws B3. By constructing the cap inthis composite fashion, the hardened steel base portion B1 may be ofsubstantially uniform thickness and cross-section, and hence theinternal stresses set up in the hardening process will be materiallyless and not so liable to canse warping during the slug casting periods.The reinforcing member B2, while irregular l in form and much heavierthan the relatively thin base portion B1, is not subject to warpingsince it is unhardened, and consequently when secured to said portion B1will serve as a rigid support thereflfor and maintain it in propershape. So far as described, the parts may be the same as those presentedin my previous patent before mentioned and in themselves constitute nopart of this invention.

'lhe gist of my present invention lies in the manner of attaching therelatively thin base portion Bl to the heavier reinforcing member B2. ltwill be noted according to Fig. Il, which is a true full-size elevationof the ordinary unreccssed S30-em mold, that the two sections B1, B2 ofthe cap could not be properly fastened together by the clamping screwsB3 in the customary way unless the thickness of the base portion B1 weresubs'antiall \,Y increased to accommodate the threaded portions of thescrews B3. rlhis, of course, would be impractical, because in that eventthe reinforcing member would have to be correspondingly reduced inthickness and hence would not only lack sufficient strength but, onaccount of its contour, would be too short to serve in the mannerrequired, it being understood, in this connection, that the over-alldimensions of the mold mustbe preserved in order to permit itsapplication to commercial machines. These difiiculties, according to myinvention, are obviated by forming the base portion B1 with studs orprojections Bt, and the reinforci member with corresponding recesses B5.lfhe projections B4 afford the additional stock required to receive theclamping screws B, and the recesses B5, which are arranged toaccommodate the projections, permit the two sections of the cap to bebrought together in contacting relation. lt will also be noted thatsuflicient clearance is allowed around the projections to insure amachined lit between the base portion Bl and its reinforcing member B2and at the same time obviate close workmanship that might otherwise berequired.

While my invention is herein illustrated iu prefered form, it will beunderstood that iinany changes and variations may be made thereinwithout departure from its scope. For example, it might be desirable toprovide the additional metal required by the clamping screws in the formof a tongue extending longitudinally of the base porextent the area ofits supporting surface.

Moreover, it is obvious that the invention could, if desired, be appliedto the body A as well as the cap B, but in the .standard 30-em molds nowin use such change is not regarded as necessary, .since thecross-section thereof is more uniform than that of the cap and thewarping tendencies not so great. ln short, as previously stated, l .donot wish to limit myself to any specific form or embodiment except in sofar as such limitations are specified in the appended claims.

Having thus described my invention, its construction and mode ofoperation, what I claim and desire to secure by Letters Patent of theUnited States, is as follows:

l. A slug casting mold presenting a side wall made up of an innerhardened steel base portion provided with a raised part or projection,and an outer unhardened steel reinforcing portion formed with acorresponding recess to accommodate said raised part or projection, andmeans engaging the raised part or proj ect-ion for clamping the twoportions together.

2. A slug casting mold presenting a side wall made up of an innerhardened steel base portion provided on its outer face and throughoutits length with a plurality of threaded projections, and an outerunhardened steel reinforcing portion formed with corresponding recessesarranged to accommodate said projections, and clamping screws passingthrough the reinforcing portion and having a threaded engagement withthe projections of the base portion for securing the two portionstogether.

3. A mold cap comprising a hardened steel base portion and an unhardenedsteel reinforcing member, the former being formed with projections andthe latter with corresponding recesses to receive them, and screwshaving a threaded engagement with said projections for clamping thereinforcing member and base portion together.

Li. A mold cap comprising a hardened steel base portion, an unhardenedsteel reinforcing member, and means for clamping said elements together,said means including a pro jection formed on the base portion and acorresponding recess formed in the reinforcing member for theaccon'nnodation of the projection.

5. A mold side wall con'iprising a solid or unrecessed, relatively thin,hardened steel base portion and an unhardened steel reinforcing member,screws for clamping said member to the base portion, and threadedprojections formed on said base portion to receive the clamping screws.

(3. A mold cap for an unrecessed mold lill) comprising` a relativelythin hardened steel base portion formed with projections, an unhardenedsteel reinforcing' member formed with corresponding recesses arranged toaccommodate the projections, and clamping screws having a threadedengagement with the projections for clamping the reinforcing member andbase portion together.

7. The unrecessed mold cap B comprising the hardened steel hase portionB1 having the projecting` studs BJ the unhardened steelreinforeingmember B2 formed with the recesses B arranged to accommodatethe studs B4, and the screws BS engaging the studs and clamping saidreinforcing member and base portion together.

8. An improvement in the method of manufacturing' mold side walls formedin two sections secured togetherl by clamping screws, which consists informing the inner base section with threaded projections to receive thescreWs,` and the outer reinforcing sect-ion with recesses to accommodatethe projections.

j In testimony whereof, I have aiiiXed my signature hereto.

RICHARD RUSSELL MEAD.

